Box upload?

Have a Box Source setup to read files from a folder but can't upload a file. Getting this error.

{"type":"error","status":403,"code":"cors_origin_not_whitelisted","context_info":{"origin":"https:\/\/skuid.na74.visual.force.com"},"help_url":"http:\/\/developers.box.com\/docs\/#errors","message":"Access denied - Did you forget to whitelist your origin in the CORS config of your app?","request_id":"fg05e1fx6scsld0s"}

The documentation call to setup CORS with the following template url:http://[your_Salesforce_org].[Salesforce_region].visual.force.com<br alt="" title="" name="" value="" type="" target="" rel="">What is [your_Salesforce_org] and [Salesforce_region]?

I'm not sure that the documentation is accurate in this regard. The URL that you need to add a CORS Whitelist entry for is the one that Box is sending back in the "origin" parameter: https://skuid.na74.visual.force.com